#include <fstream>
#define DIM 3000010
using namespace std;

ifstream fin ("interclasari.in" );
ofstream fout("interclasari.out");

int N, M, i, j, K, ok, minim;
int V[DIM], k, x;

void SetUp(){
     fin >> K;
     for(k = 1; k <= K; k ++){
          fin >> N;
          for(i = 1; i <= N; i ++){
               fin >> x;
               V[x] ++;
          }
     }
     return;
}

void YEEEY(){
     for(i = 0; i < DIM; i ++)
          while(V[i] != 0){
               fout << i << " ";
               V[i] --;
          }
     return;
}

int main(){
     SetUp();
     YEEEY();
     return 0;
}